#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

bool check(ll lx,ll x)
{
	if(lx%x==0&&(lx/x)%2==0)
		return true;
	else
		return false;
}
int main()
{
	ll x = 343720;
	ll y = 233333;
	ll t = 1;
	ll lx = 0;
	ll ly = 0;
	while(1)
	{
		lx = t*15;
		ly = t*17;
		if(check(lx,x)&&check(ly,y))
			break;
		
		t++;
	}
	cout<<setprecision(2)<<fixed;
	cout<<sqrt(lx*lx+ly*ly);
	return 0;
}
